High-Temperature X-Ray Study of the Formation and Delamination of Manganese-Alumina Spinel Mn1.5Al1.5O4
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Translated
|
| Journal |
Journal of Structural Chemistry
ISSN: 0022-4766
, E-ISSN: 1573-8779
|
| Output data |
Year: 2009,
Volume: 50,
Number: 3,
Pages: 474-478
Pages count
: 5
DOI:
10.1007/s10947-009-0071-6
|
| Tags |
High-temperature X-ray diffraction, Manganese-alumina systems, Phase transformations |
| Authors |
Bulavchenko O.A.
1,2
,
Tsybulya S.V.
1,2
,
Cherepanova S.V.
1,2
,
Afonasenko T.N.
3
,
Tsyrulnikov P.G.
3
|
| Affiliations |
| 1 |
G. K. Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk
|
| 2 |
Novosibirsk State University
|
| 3 |
Institute of Processing of Hydrocarbons, Siberian Division, Russian Academy of Sciences, Omsk
|
|
Funding (2)
|
1
|
The Ministry of Education and Science of the Russian Federation
|
2.1.1/729
|
|
2
|
Президиум СО РАН
|
36
|
The behavior of the manganese-alumina system with Mn:Al = 1:1 on heating in air and vacuum was studied. The starting samples were mixtures of β-Mn3O4, α-Mn2O3, and γ-Al2O3. On heating to 950°C in air, the samples were partially oxidized into α-Mn2O3, and corundum α-Al2O3 formed along with mixed manganese-alumina cubic spinel, whose composition was close to Mn2AlO4. In vacuum at 1200°C, the starting sample with a ratio of Mn:Al = 1:1 transformed into the manganese-alumina spinel Mn1.5Al1.5O4, which retained its cubic structure after slow cooling in vacuum. When cooled in air, this solid solution delaminated, and a nanocrystalline Mn2.8Al0.2O4 phase formed, whose structure was β-Mn3O4 type tetragonal spinel.